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單項(xiàng)選擇題

（）I understand what you say, I can't agree with you

A.While
B.When
C.As
D.If

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單項(xiàng)選擇題

Which of the following is not correct? （）

A.It is useless to complain.
B.It is useless complaining.
C.Complaining is useless.
D.It is useless of complaining.

單項(xiàng)選擇題

He seemed to be unaware（）the trouble he was causing.

A.for
B.on
C.of
D.about

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